ZyXEL Communications VES1724-56 - Page 59

Chapter 7 System Status and Port Statistics
VES1724-56 User’s Guide
59
Line Attenuation This field displays the upstream/downstream line attenuation the Switch detects
according to the line length, frequency and the line wire diameter.
Line attenuation increases with line length and frequency. Bigger wires reduce
attenuation.
Transmit Power This field displays the upstream/downstream transmission power of the line. It ranges
from 0 to 25.5 dBm, with 0.1 dB steps for downstream. It ranges from 0 to 25.5 dBm,
with 0.1 dB steps for upstream.
Trellis This field displays whether trellis coding is used in the upstream/downstream
transmission.
Snr Mode This field displays whether the upstream/downstream transmitter referred virtual noise
is enabled or disabled.
Last State This field displays the last successful transmitted initialization state for upstream and
downstream directions through the line. The possible states are as shown next.
vtucG9941, vtucQuiet1, vtucChDiscov1, vtucSynchro1, vtucPilot1, vtucQuiet2,
vtucPeriodic1, vtucSynchro2, vtucChDiscov2, vtucSynchro3, vtucTraining1,
vtucSynchro4, vtucPilot2, vtucTeq, vtucEct, vtucPilot3, vtucPeriodic2,
vtucTraining2, vtucSynchro5, vtucMedley, vtucSynchro6, vtucShowtime,
vturG9941, vturQuiet1, vturChDiscov1, vturSynchro1, vturLineprobe,
vturPeriodic1, vturSynchro2, vturChDiscov2, vturSynchro3, vturQuiet2,
vturTraining1, vturSynchro4, vturTeq, vturQuiet3, vturEct, vturPeriodic2,
vturTraining2, vturSynchro5, vturMedley, vturSynchro6, vturShowtime.
Current State This field displays any existing upstream/downstream failure for the line.
NoDefect: No failure was detected.
LossOfFraming: A loss of frame synchronization was detected.
LossOfSignal: A loss of signal was detected.
LossOfPower: A loss of power was detected.
InitFailure: The most recent initialization failed.
Actual net data
rate
This field displays the actual upstream/downstream data transmission rate.
Prev net data
rate
This field displays the previous upstream/downstream data transmission rate just before
the rate changed.
Actual Delay This field displays the actual upstream/downstream interleave delay (in milliseconds)
used on the line.
Actual INP This field displays the actual impulse noise protection (INP).
Receive Power This field displays the upstream/downstream receiving power of the line. The range is
from 0 to 25.5 dBm with 0.1 dB steps for both downstream and upstream traffic.
INP Report This field displays the method used to compute the actual INP above. Formula displays
if the value is computed according to an INP_no_erasure formula defined in the ITU-T
G.993.2 standard.
Codeword Size This field displays the actual size of Reed-Solomon codeword used in this line. Reed-
Solomon (RS) Code is an error-correction code.
RFEC RFEC refers to Redundancy Forward Error Correction. This field displays the actual
number of Reed-Solomon redundancy bytes. The Reed-Solomon code has the capability
to correct errors by adding redundancy bytes. The longer the Reed-Solomon redundancy
bytes the higher the error correction capability.
LSYMB LSYMB refers to Latency SYMbol Bit. This field displays the actual number of bits per
symbol.
Table 7 Status: VDSL Port Details (continued)
LABEL DESCRIPTION